@angular/cdk
Version:
Angular Material Component Development Kit
44 lines • 5.3 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** IDs are delimited by an empty space, as per the spec. */
const ID_DELIMITER = ' ';
/**
* Adds the given ID to the specified ARIA attribute on an element.
* Used for attributes such as aria-labelledby, aria-owns, etc.
*/
export function addAriaReferencedId(el, attr, id) {
const ids = getAriaReferenceIds(el, attr);
if (ids.some(existingId => existingId.trim() == id.trim())) {
return;
}
ids.push(id.trim());
el.setAttribute(attr, ids.join(ID_DELIMITER));
}
/**
* Removes the given ID from the specified ARIA attribute on an element.
* Used for attributes such as aria-labelledby, aria-owns, etc.
*/
export function removeAriaReferencedId(el, attr, id) {
const ids = getAriaReferenceIds(el, attr);
const filteredIds = ids.filter(val => val != id.trim());
if (filteredIds.length) {
el.setAttribute(attr, filteredIds.join(ID_DELIMITER));
}
else {
el.removeAttribute(attr);
}
}
/**
* Gets the list of IDs referenced by the given ARIA attribute on an element.
* Used for attributes such as aria-labelledby, aria-owns, etc.
*/
export function getAriaReferenceIds(el, attr) {
// Get string array of all individual ids (whitespace delimited) in the attribute value
return (el.getAttribute(attr) || '').match(/\S+/g) || [];
}
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